CN1288345C - Valve assembly for recipreocating compressor - Google Patents

Abstract

The invention discloses a valve assembly of a reciprocating compressor, which comprises a discharge orifice plate with a discharge hole, a reed valve plate with a reed valve, and a stopper plate with a stopper. The exhaust orifice plate, reed valve plate and stopper plate are assembled with the cylinder head together with the cylinder head when the cylinder head is installed on the cylinder. The stopper is bent at a predetermined inclination angle at the connection end so that the free end of the stopper protrudes toward the cylinder head. The pressure unit includes a first pressure protrusion pressing the connection end of the stopper, a second pressure protrusion pressing the free end of the stopper, and a third pressure protrusion pressing an intermediate point between the connection end and the free end of the stopper. The stop is thereby supported and allowed to apply pressure to the reed valve P while arching at a location between the cylinder head and the exhaust orifice. The components of the valve assembly are thereby simply and easily assembled into a single body and the operating shock and noise caused by the operation of the reed valve is reduced, thereby enabling quiet operation of the reciprocating compressor.

Description

Valve components for reciprocating compressors

Cross Reference Related Applications

This application claims priority from Korean Patent Application No. 2003-21822 filed in the Korean Intellectual Property Office on April 8, 2003, the contents of which are hereby incorporated by reference in their entirety.

technical field

The present invention relates generally to a reciprocating compressor, and more particularly to a valve assembly for a reciprocating compressor, the components of which are simply and easily assembled into a single body and which reduce the need for The impact and noise caused by the operation of the reed valve (reed valve), so that the reciprocating compressor runs quietly.

Background technique

As is well known to those of ordinary skill in the art, a reciprocating compressor includes a number of components, namely, a stator, rotor, crankshaft, cylinder, piston, and cylinder head, which are hermetically housed in a hermetic housing. The stator and rotor are installed in a sealed casing, the stator is fixed, and the rotor is rotatable. The crankshaft passes axially fixedly through the rotor, and the crankshaft rotates with the rotor in response to electromagnetic interaction between the stator and the rotor when the compressor is powered on. A chamber is formed in the cylinder into which gas is sucked and compressed, and a piston is accommodated in the cylinder for rectilinear reciprocating motion in the cylinder in response to rotation of a crankshaft. The cylinder head covers the top end of the cylinder. In the operation of the reciprocating compressor, the piston linearly reciprocates in the cylinder in response to the rotation of the crankshaft, thereby drawing gas into the cylinder in the sealed housing, compressing the gas, and discharging the compressed gas at high pressure from the cylinder to the Seal the outside of the enclosure. The reciprocating compressor having the above structure is preferably used in a refrigeration system such as a refrigerator or an air conditioner for compressing a low-pressure gas refrigerant to make the gas refrigerant into a high-pressure refrigerant.

In a reciprocating compressor, a valve assembly is interposed between the cylinder and cylinder head to control the intake of low pressure gas into the cylinder inside the hermetic enclosure and the discharge of high pressure gas from the cylinder to the outside of the hermetic enclosure during operation of the compressor.

A valve assembly of a conventional reciprocating compressor includes a discharge valve unit having a reed valve, a stopper, and a retainer. The reed valve controls the discharge of gas from the cylinder to the outside of the sealed enclosure, while the stopper limits the opening ratio of the reed valve within a certain range. The retainer supports the stopper. The reed valve, stopper and retainer of the exhaust valve unit are assembled in sequence on the exhaust orifice plate with the suction hole and the exhaust hole. The discharge orifice plate with the discharge valve unit is set together with the suction valve plate integrally with the suction valve at a position between the cylinder and the cylinder head using a plurality of bolts.

When the piston moves from the bottom dead center to the top dead center in the cylinder, the gas is compressed in the cylinder. The pressure of the compressed gas is thereby exerted on the exhaust opening, so that the free end of the reed valve is elastically bent together with the stopper towards the cylinder head, thereby opening the exhaust opening. High-pressure compressed gas is discharged from the cylinder to the outside of the sealed casing through the cylinder head and the open vent hole. When the piston moves from the top dead center to the bottom dead center in the cylinder, the reed valve elastically closes the exhaust hole due to the restoring force of the stopper and the reed valve and at the same time the suction valve of the suction valve plate opens to let the low pressure gas through The open suction port and cylinder head suck in the cylinder.

However, the conventional reciprocating compressor has problems in that, in the conventional valve assembly, a reed valve controlling the discharge hole, a stopper restricting the opening ratio of the reed valve within a predetermined range, and a supporting stop The holder of the device is produced separately and assembled on the vent plate in sequence. Thus, the reed valve, stopper, and retainer must be sequentially assembled on the orifice plate before installing the orifice plate between the cylinder and the cylinder head using multiple bolts. Excessive time is spent when assembling the reed valve, stopper and retainer into the valve assembly.

In the valve assembly of the traditional reciprocating compressor, the first end of the reed valve forms the joint end where the reed valve is installed on the discharge orifice plate, and the second end of the reed valve forms the free end, which is due to the The exhaust pressure on it bends elastically from the exhaust orifice towards the cylinder head. Thus, the free end of the reed valve repeatedly hits the stopper and the exhaust orifice plate during the linear reciprocating motion of the piston in the cylinder, thereby generating running shock and noise. In addition, the free end of the reed valve vibrates and the resulting high frequency noise prevents the reciprocating compressor from running quietly.

Contents of the invention

Accordingly, an aspect of the present invention is to provide a valve assembly for a reciprocating compressor, the components of which are simply and easily assembled into a single body.

Another aspect of the present invention provides a valve assembly for a reciprocating compressor that reduces the shock and noise caused by the operation of the reed valve, thereby allowing the reciprocating compressor to operate quietly.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The above and other aspects of the present invention are achieved by providing a valve assembly of a reciprocating compressor comprising: a cylinder; a cylinder head; a pressure unit integrally formed on a lower surface of the cylinder head; and an arrangement A valve assembly between the cylinder and the cylinder head, said valve assembly comprising: an exhaust orifice plate having an exhaust hole communicating with the cylinder; a reed valve plate in which the reed valve is integrally formed for opening or close the exhaust hole; and a stopper plate in which the stopper is integrally formed so as to limit the opening ratio of the reed valve within a predetermined range to exhaust gas when the cylinder head is mounted on the cylinder The orifice plate, reed valve plate and stopper plate are assembled with the cylinder together with the cylinder head. The pressure unit presses the stopper to support the stopper and allows the stopper to apply pressure to the reed valve.

In the valve assembly, a reed valve is formed by cutting a predetermined portion of a reed valve plate, a first end of the reed valve forms a connection end, and a second end of the reed valve forms a free end.

The stopper is formed by cutting a predetermined part of the stopper plate, the first end of the stopper forms a connecting end, and the second end of the stopper forms a free end, and the stopper is bent at a predetermined inclination angle at its connecting end so that the free end of the stopper end protrudes toward the cylinder head.

The pressure unit includes a first pressure protrusion protruding from a position corresponding to the connection end of the cylinder head and the stopper, thereby pressing the connection end of the stopper; a second pressure protrusion, the first pressure protrusion Two pressure protrusions protrude from the position corresponding to the free end of the cylinder head and the stopper, thereby pressing the free end of the stopper; and the third pressure protrusion; The position corresponding to the middle point of the stopper between the connection end and the free end protrudes, thereby pressing the middle point of the stopper.

The second pressure protrusion is slightly longer than the first pressure protrusion, and the third pressure protrusion is slightly shorter than the first pressure protrusion, so that the first pressure protrusion, the second pressure protrusion and the third pressure protrusion support the stopper At the same time, the stopper is bowed at the position between the cylinder head and the exhaust orifice plate, and the free end of the stopper pressed by the second pressure protrusion prestresses the free end of the reed valve.

In the valve assembly, the third pressure protrusion is eccentrically located between the first pressure protrusion and the second pressure protrusion, and an exhaust hole is formed at a position of the exhaust orifice plate corresponding to the third pressure protrusion.

In this case, the position of the third pressure bump is preferably biased towards the second pressure bump.

In the valve assembly, a recess is formed on the surface of the vent plate around the location of the vent hole so that the reed valve closes the vent while part of the reed valve is in contact with the area of the vent plate surrounding the vent hole and the recess. stomata.

Description of drawings

The above and other aspects and advantages of the present invention will become apparent and comprehensible by describing the preferred embodiments in detail with reference to the accompanying drawings, in which:

1 is a longitudinal sectional view of a reciprocating compressor with a valve assembly according to an embodiment of the present invention;

Figure 2 is an exploded perspective view of the valve assembly shown in Figure 1;

Figure 3 is a top perspective view of a vent orifice plate included in the valve assembly shown in Figure 2;

Figure 4 is a top perspective view of a reed valve plate included in the valve assembly shown in Figure 2;

Figure 5 is a top perspective view of a stopper plate included in the valve assembly shown in Figure 2;

6 is a bottom perspective view of a cylinder head included in the compressor shown in FIG. 1 and assembled with the valve assembly of FIG. 2;

Fig. 7 is a sectional view along line A-A among Fig. 2, this moment, reed valve closes exhaust hole; And

Fig. 8 is a sectional view along line A-A in Fig. 2, when the reed valve opens the vent hole.

Detailed ways

The preferred embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like elements throughout.

FIG. 1 is a longitudinal sectional view of a reciprocating compressor having a valve assembly according to an embodiment of the present invention. As shown, the reciprocating compressor of the present invention includes a plurality of elements, namely, a stator 1, a rotor 2, a crankshaft 3, a cylinder 4, a piston 6, and a cylinder head 7, which are hermetically accommodated in a hermetic casing 10. The stator 1 and the rotor 2 are installed in the sealed casing 10, the stator 1 cannot move, and the rotor 2 can rotate. The crankshaft 3 is axially inserted into the rotor 2 and rotates together with the rotor 2 . A compression chamber is formed in the cylinder 4 . Piston 6 is housed in cylinder 4 and connected to crankshaft 3 via connecting rod 5 . The cylinder head 7 covers the top of the cylinder 4 .

A suction duct 8 and an exhaust duct (not shown in the figure) pass through the sealed casing 10 and are mounted on the cylinder head 7 so that gas is sucked into the cylinder 4 through the suction duct 8 . The gas is compressed in the cylinder 4 and discharged from the cylinder 4 to the outside of the sealed case 10 through an exhaust duct. Furthermore, a valve assembly 20 according to the present invention is arranged at a position between the cylinder 4 and the cylinder head 7 for controlling the suction of gas into and the discharge of gas from the hermetic casing 10 during operation of the compressor.

Fig. 2 is an exploded perspective view illustrating the structure of a valve assembly according to the present invention. As shown, the valve assembly 20 includes a vent plate 30 having a vent hole 31 communicating with the cylinder 4 , a reed valve plate 40 having a reed valve 41 , and a stopper plate 50 having a stopper 51 . In the valve assembly 20 , the exhaust orifice plate 30 , the reed valve plate 40 , and the stopper plate 50 are sequentially arranged between the cylinder 4 and the cylinder head 7 .

The valve assembly 20 also includes a gasket 60 and a suction valve plate (not shown). The gasket 60 is tightly or hermetically interposed between the cylinder head 7 and the stopper plate 50 for preventing gas leakage from the joint of the cylinder head 7 and the stopper plate 50 . A suction valve plate (not shown in the figure) having a suction valve is disposed under the discharge orifice plate 30 so that the suction valve controls the suction holes 32 provided on the discharge orifice plate 30 .

The invention is characterized by a modified structure of the reed valve and stopper to achieve the various aspects of the invention, so the suction valve plate is not shown in the drawings and further description of the suction valve plate is not believed to be necessary.

In the valve assembly 20, all the exhaust orifice plate 30, the reed valve plate 40, the stopper plate 50, the gasket 60 and the cylinder head 7 have a rectangular shape with chamfered or rounded corners. The vent plate 30, the reed valve plate 40, the stopper plate 50, and the spacer 60 are also provided with locking holes 35, 45, 55 and 65 at the corners. Therefore, when the cylinder head 7 is fixed to the cylinder 4 using the bolts 26, the exhaust orifice plate 30, the reed valve plate 40, the stopper plate 50, and the spacer 60 are assembled with each other. In this case, the bolt 26 is first inserted into the locking hole 25 provided at the corner of the cylinder head 7, and passes sequentially through the gasket and the locking holes 65, 55 and 35 of the three plates before being screwed and fixed to the cylinder 4. .

In order to press the stopper 51 at several points so as to support the stopper 51 while forming the stopper 51 into a predetermined shape so as to allow the stopper 51 to apply a predetermined pressure to the free end of the reed valve 41, the pressure unit 70 is provided on the cylinder head 7 on the lower surface. The structure of the reed valve 41 , the stopper 51 and the pressure unit 70 will be described in detail below with reference to FIGS. 3 to 6 .

3 to 5 are top perspective views of the vent plate, reed valve plate and stopper plate, respectively, of the valve assembly shown in FIG. 2 . FIG. 6 is a top perspective view of the cylinder head assembled with the valve assembly of FIG. 2 .

As shown in FIG. 3 , the vent plate 30 is a flat plate having a predetermined thickness, and one locking hole 35 is formed in each of rounded corners of the vent plate 30 . An exhaust hole 31 and an air suction hole 32 are formed in the exhaust orifice plate 30 through which gas is sucked into the cylinder 4 and gas is discharged from the cylinder 4 through the exhaust hole 31 to the outside of the sealed case 10 in the cylinder 4 is compressed.

Recesses 33 are formed on the surface of the vent plate 30 at positions surrounding the vent holes 31 . The dimensions of the recess 33 are slightly smaller than the dimensions of the reed valve 41 of the reed valve plate 40 . Thus, when reed valve 41 closes vent 31 , only a portion of reed valve 41 is in contact with the area or area of vent plate 30 surrounding vent 31 and recess 33 . The surface of the vent plate 40 is thus reduced when the reed valve 41 closes the vent hole 31 , so that the operating noise of the reed valve 41 can be reduced.

As shown in FIG. 4 , the reed valve plate 40 is a flat plate that is significantly thinner than the vent plate 30 . A locking hole 45 is formed in each of the chamfered corners of the reed valve plate 40 . The reed valve 41 is disposed in the reed valve plate 40 at a position corresponding to the recess 33 including the exhaust hole 31 of the exhaust hole plate 30 , thereby opening or closing the exhaust hole 31 .

The reed valve 41 is integrally formed in the reed valve plate 40 by cutting a predetermined portion of the reed valve plate 40 along a U-shaped line. The reed valve 41 is thus integrally formed at its uncut first end with the remainder of the reed valve plate 40 , so that the first end of the reed valve 41 forms the connecting end 42 . The second end of the reed valve 41 separated from the remainder of the reed valve plate 40 forms a free end 43 . The reed valve 41 is elastically bent at the free end 43 to open or close the exhaust hole 31 .

As shown in FIG. 5 , the stopper plate 50 is a flat plate that is significantly thinner than the vent plate 30 in the same manner as described for the reed valve plate 40 . A locking hole 55 is formed in each of the chamfered corners of the stopper plate 50 . A stopper 51 having a size corresponding to the reed valve 41 is provided at a position corresponding to the reed valve 41 in the stopper plate 50 . The stopper 51 limits the opening ratio of the reed valve 41 within a predetermined range, and applies a preload to the free end 43 of the reed valve 41 .

In the same manner as described for the reed valve 41 , the stopper 51 is integrally formed in the stopper plate 50 by cutting a predetermined portion of the stopper plate 50 along a U-shaped line. The stopper 51 is thus integrated at its uncut first end with the remainder of the stopper plate 50 and the first end of the stopper 51 forms the connection end 52 . The second end of the stopper 51 separated from the remainder of the stopper plate 50 forms a free end 53 . The free end 53 of the stopper 51 limits the opening ratio of the reed valve 41 within a predetermined range, and applies a preload to the free end 43 of the reed valve 41 .

The stopper 51 is also bent at an angle of inclination “θ” at the connection end 52 relative to the rest of the stopper plate 50 so that the free end 53 of the stopper 51 protrudes obliquely toward the cylinder head 7 . Therefore, when the stopper plate 50 is installed in the valve assembly 20 together with the reed valve plate 40 and the gasket 60 at the position between the cylinder head 7 and the exhaust orifice plate 30 , the pressure unit 70 of the cylinder head 7 stops at the stopper. Several points of 51 press the stopper 51, thereby supporting the stopper 51 while bending the stopper 51 into an arcuate shape. In this case, it is preferable to set the inclination angle "θ" of the stopper 51 with respect to the rest of the stopper plate 50 to 90° or less.

As shown in FIG. 6, the pressure unit 70 is provided on the lower surface of the cylinder head 7 having a lock hole 25 in each of its rounded corners. The pressure unit 70 presses the raised stopper 51 at several points in order to support the stopper 51 while arching the stopper 51 , thereby allowing the stopper 51 to apply a pre-pressure to the free end 43 of the reed valve 41 .

The pressure unit 70 includes a first pressure protrusion 71 , a second pressure protrusion 72 and a third pressure protrusion 73 . The first pressure protrusion 71 is formed in the cylinder head 7 at a position corresponding to the connection end 52 of the stopper 51 . The second pressure protrusion 72 is formed in the cylinder head 7 at a position corresponding to the free end 52 of the stopper 51 . The third pressure protrusion 73 is formed in the cylinder head 7 at a position corresponding to an intermediate point of the stopper 51 between the connection end 52 and the free end 53 . The arrangement of the first pressure protrusion 71 , the second pressure protrusion 72 and the third pressure protrusion 73 in the cylinder head 7 will be described below with reference to FIGS. 7 and 8 .

Figures 7 and 8 are cross-sectional views along line A-A in Figure 2, respectively, when the reed valve closes and opens the exhaust hole, respectively.

As shown in FIG. 7, the first pressure protrusion 71 and the second pressure protrusion 72 protrude toward the cylinder 4 from the lower surface 7a of the cylinder head 7, so that the pressure surfaces of the first pressure protrusion 71 and the second pressure protrusion 72 Protrudes on the lower surface 7a. In this case, the second pressure protrusion 72 is slightly longer than the first pressure protrusion 71 , while the third pressure protrusion 73 is slightly shorter than the first pressure protrusion 71 . That is, the third pressure protrusion 73 protrudes in a recess formed on the lower surface 7a of the cylinder head 7 so that the pressure surface of the third pressure protrusion 73 does not reach the level of the lower surface 7a. Thus, the first pressure protrusion 71, the second pressure protrusion 72 and the third pressure protrusion 73 of the pressure unit 70 respectively press the connecting end 52, the free end 52 and the space between the two ends 52 and 53 of the stopper 51. The intermediate point, thereby supporting the stopper 51 while arching the stopper 51 .

In other words, the first pressing protrusion 71 presses the connection end 52 of the stopper 51 connected to the rest of the stopper plate 50, whereby the connection end 52 is fixed or held without being moved. The second pressure protrusion 72 slightly presses the free end 53 of the stopper 51 with the free end 53 positioned so that it is movable towards the connection end 52 through the gap between the cylinder head 7 and the exhaust orifice plate 30 . Furthermore, the third pressure protrusion 73 , which does not reach the level of the lower surface 7a, slightly presses the middle point of the stopper 51 between the two ends 52 and 53 so that the stopper 51 is supported while forming an arc.

Since the stopper 51 is supported at three points by the first pressure protrusion 71, the second pressure protrusion 72, and the third pressure protrusion 73 of the pressure unit 70, while the stopper 51 is bent into an arc as described above, therefore, in the spring When the free end 43 of the reed valve 41 is movable toward the connection end 42, the free end 43 of the reed valve 41 placed between the stopper 51 and the exhaust orifice plate 30 is moved by the free end 53 of the stopper 51 along the direction toward the discharge orifice. The direction of the air hole plate 30 is preloaded.

In addition, the first pressure protrusion 71 and the third pressure protrusion 73 are separated from each other by a distance L1 which is slightly longer than the distance L2 between the second pressure protrusion 72 and the third pressure protrusion 73 . That is, the position of the third pressure protrusion 73 is slightly closer to the second pressure protrusion 72 than to the first pressure protrusion 71 . In other words, the third pressure protrusion 73 is located between the first pressure protrusion 71 and the second pressure protrusion 72 , and the third pressure protrusion 73 is slightly biased towards the second pressure protrusion 72 . Due to the specific arrangement of the first pressure protrusion 71 , the second pressure protrusion 72 and the third pressure protrusion 73 , the reed valve 41 is closed or opened in a position slightly closer to the free end 43 than to the connection end 42 of the reed valve 41 The exhaust hole 31 of the exhaust hole plate 30. In this case, the exhaust hole 31 is formed at a position of the exhaust hole plate 30 corresponding to the third pressure protrusion 73 . Thus, the present invention achieves less deformation of the reed valve 41 during operation of the reed valve 41 as compared to conventional valve assemblies in which the reed valve closes or opens the vent hole at the center of the reed valve. Operational shock and noise caused by the operation of the reed valve 41 of the present invention can thereby be reduced. In addition, the above-mentioned reed valve 41 opens or closes the exhaust hole 31 more smoothly.

The operation of the valve assembly 20 for a reciprocating compressor according to the present invention having the above structure is as follows. That is, during compressor operation in which the piston 6 moves to the bottom dead center in the cylinder 4 , the free end 53 of the stopper 51 precompresses the reed valve 41 in a direction toward the discharge orifice plate 30 as shown in FIG. The reed valve 41 in the above state thus closes the exhaust hole 31 .

However, when the piston 6 moves from the bottom dead center to the top dead center in the cylinder 4 , the pressure of the gas compressed in the cylinder 4 increases to become higher than the pre-pressure applied to the reed valve 41 by the stopper 51 . Thus, the portion of the reed valve 41 corresponding to the exhaust hole 31 moves toward the cylinder head 7 as shown in FIG. 8 , and at the same time the free end 43 of the reed valve 41 moves toward the connection end 42 . This opens the vent hole 31 .

During the operation of opening the exhaust hole 31, the free end 53 of the stopper 51, which applies a pre-pressure to the free end 43 of the reed valve 41, passes between the third pressure protrusion 73 of the cylinder head 7 and the exhaust orifice plate 30. The gap between them moves slightly towards the connecting end 52 of the stopper 51.

When the piston 6 moves again from the top dead center to the bottom dead center in the cylinder 4, the stopper 51 and the reed valve 41 return to their original shape. As a result, the reed valve 41 closes the vent hole 31 again, as shown in FIG. 7 .

As apparent from the foregoing description, the present invention provides a valve assembly for a reciprocating compressor, the components of which are simply and easily assembled into a single body. That is, the reed valve and the stopper of the valve assembly according to the present invention are respectively integrally formed with the reed valve plate and the stopper plate, which are simply and easily connected with the cylinder head together with the cylinder head by using a plurality of bolts. Assemble. Thus, the reed valve and the stopper are simply and easily assembled into the valve assembly, thereby saving time and reducing costs when producing the reciprocating compressor.

In the valve assembly for a reciprocating compressor according to the present invention, the pressure unit provided on the lower surface of the cylinder head presses the stopper at several points, thereby, supporting the stopper and bending the stopper smoothly into an arcuate shape, And the stopper applies a preload to the free end of the reed valve. In addition, the reed valve opens or closes the vent hole while a part of the reed valve contacts the vent hole at an intermediate portion between the free end and the connection end of the reed valve. Thus, the valve assembly significantly reduces operating shock and noise caused by the operation of the reed valve when opening or closing the vent hole. In addition, the free end of the reed valve does not vibrate, thereby reducing high-frequency noise and making the reciprocating compressor operate quietly and improving the operating performance of the reciprocating compressor.

Although the preferred embodiment of the present invention has been shown and described, modifications can be made to this embodiment without departing from the principles and spirit of the present invention, the scope defined by the claims and their equivalents, which is of great importance to those skilled in the art. obvious to those of ordinary skill.

Claims (8)

1. the valve member of a reciprocal compressor, described compressor comprises:

Cylinder;

Cylinder cap;

Pressure unit, described pressure unit are integrally formed on the lower surface of cylinder cap; And

Be arranged in the valve member between cylinder and the cylinder cap, described valve member comprises:

Vent panel with the exhaust port that is communicated with cylinder;

Reed valve plate, leaf valve are integrally formed in the reed valve plate, so that open or close exhaust port; And

Stopper plate, stopper are integrally formed in the stopper plate, so that the ratio of opening of leaf valve is limited in predetermined scope, vent panel, reed valve plate and stopper plate are fitted together with cylinder cap and cylinder block when cylinder cap is installed on the cylinder,

It is characterized in that:

Described pressure unit is pushed stopper so that support stopper, and allows stopper to apply pressure on the leaf valve.

2. valve member according to claim 1, wherein leaf valve forms by the predetermined part of cutting reed valve plate, and first end of leaf valve forms connecting end, and second end of leaf valve forms free end.

3. valve member according to claim 2, wherein stopper forms by the predetermined part of cutting stopper plate, first end of stopper forms connecting end, and second end of stopper forms free end, stopper is at the crooked predetermined tilt angle of its connecting end, so that the free end of stopper is towards the cylinder cap projection.

4. valve member according to claim 3, wherein pressure unit comprises:

The first pressure projection, the described first pressure projection is stretched out from the corresponding position of the connecting end of cylinder cap and stopper, pushes the connecting end of stopper thus;

The second pressure projection, the described second pressure projection is stretched out from the corresponding position of the free end of cylinder cap and stopper, pushes the free end of stopper thus; And

The 3rd pressure projection; Described the 3rd pressure projection is stretched out from the connecting end of cylinder cap and stopper and the corresponding position of intermediate point of the stopper between the free end, pushes the intermediate point of stopper thus.

5. valve member according to claim 4, wherein the second pressure convexity, the first pressure projection is long slightly, and the 3rd pressure convexity first pressure projection is short slightly, so that the first pressure projection, second pressure projection and the 3rd pressure projection support stopper that stopper is formed are arc the position between cylinder cap and vent panel simultaneously, and the free end of the free end Pre-Pressed Spring Leaf valve of the stopper pushed of the second pressure projection.

6. valve member according to claim 5, wherein the 3rd pressure projection is prejudicially between first pressure projection and the second pressure projection, and exhaust port is formed on vent panel and the protruding corresponding position of the 3rd pressure.

7. valve member according to claim 6, wherein the second pressure projection is partial in the position of the 3rd pressure projection.

8. valve member according to claim 6, wherein the position around exhaust port is formed with recess on the surface of vent panel, so that close exhaust port in the part of leaf valve with the regional contacted while leaf valve of the vent panel that centers on exhaust port and recess.

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